BBC News

At least 13 people have died after a roof collapsed in a nightclub in the Dominican Republic.
Many more are injured and rescue workers are still working to free people from the rubble.
It is not yet clear what caused the incident, which happened in the early hours of Tuesday during a concert by the popular merengue singer Rubby Pérez at the Jet Set discotheque in the capital, Santo Domingo.
The president of the Dominican Republic, Luis Abinader, has expressed his condolences to the families affected.
The director of the Emergency Operations Centre (COE), Juan Manuel Méndez, said they were still looking for people under the debris.
He added that ambulances had made 93 trips to the area’s hospitals, at times carrying more than one patient. Officials are still trying to determine the total number of those injured.
The preliminary number of those killed is 13.
Mr Méndez said he was hopeful that many of those buried under the collapsed roof were still alive.